pkg/osutil: use leveled log

pkg/osutil/interrupt_unix.go

@@ -17,7 +17,6 @@
 package osutil
 
 import (
-	"log"
 	"os"
 	"os/signal"
 	"sync"
@@ -58,7 +57,7 @@ func HandleInterrupts() {
 
 		interruptExitMu.Lock()
 
-		log.Printf("received %v signal, shutting down...", sig)
+		plog.Noticef("received %v signal, shutting down...", sig)
 
 		for _, h := range ihs {
 			h()

pkg/osutil/osutil.go

@@ -17,6 +17,12 @@ package osutil
 import (
 	"os"
 	"strings"
+
+	"github.com/coreos/pkg/capnslog"
+)
+
+var (
+	plog = capnslog.NewPackageLogger("github.com/coreos/etcd/pkg", "osutil")
 )
 
 func Unsetenv(key string) error {